But a CNN investigation sheds new light on how leading e-cigarette company Juul Labs was encouraging -- and at times paying for -- social media users to promote its nicotine-filled product to thousands of their followers.

Katowice, Poland, the city hosting the COP24 global warming summit, is paradoxically the capital of coal country. CNN's Nick Paton Walsh goes inside a coal mine to see how it differs from the climate change talks happening on the surface.

Dion Williams played college football at Wake Forest and had dreams of playing in the NFL but concussions forced him off the field. That's when Williams changed gears and found success on NASCAR's pit road.

In a video posted on YouTube, Chinese scientist He Jiankui announced to the world that he successfully used the gene-editing tool CRISPR-Cas9 to modify the DNA of two embryos before birth, essentially creating the world's first genetically modified humans.

Lead, bacteria and other contaminants were found in this small Louisiana town's water that doesn't have the funds to fix its aging infrastructure. Watch the complete documentary, "Dirty Water: Danger from the Tap," on CNNgo

Speaking at a genome summit in Hong Kong, He Jiankui defended his claim that he created the world's first gene-edited babies using CRISPR. The tool's co-inventor, Jennifer Doudna, shares her deep concerns with CNN's Kristie Lu Stout.

CNN's Chris Cuomo asked the Commissioner of US Customs and Border Protection Kevin McAleenan about the tear gas used against migrants at the US-Mexico border, after President Trump claimed border agents used a "minor form" of tear gas.

A Chinese scientist claims to have delivered the world's first genetically-edited babies. Experts worldwide have voiced outrage at such use of the technology and the hospital where he claims the twins were born has denied involvement.